Often considered the most difficult chapter for beginners.
Because the book is so dense, many learners use it for self-study. Without an instructor, a solution manual is the only way to check if a proof is valid. Geometria Moderna De Moise And Downs Solucionario
If you're a student or teacher of geometry, I highly recommend using "Geometría Moderna" by Moise and Downs, along with the solucionario, as a supplement. Be sure to use the solucionario in a way that promotes learning and understanding, rather than simply relying on it for answers. Often considered the most difficult chapter for beginners
Platforms like Internet Archive or Scribd sometimes host hand-written or student-made solution sets. Search for "Moise Downs Geometry Solutions PDF." along with the solucionario